But Miller subsequently left to join rival Didi Chuxing's new autonomous-driving lab, located in Mountain View, California. On Friday, Miller tweeted that he was leaving Didi, calling his experience there a "short but amazing ride." Valasek soon tweeted at him asking about "getting the band back together."

Recode subsequently confirmed that Valasek had left Uber, where he was head of security technology for the ride-sharing company's self-driving car program. Finally, Valasek tweeted that he and Miller were joining Cruise as joint heads of the GM subsidiary's security team.

This likely marks the first time the duo will work in an official capacity at an actual automaker. Miller and Valasek achieved fame in 2015 for hacking a Jeep Cherokee and taking control of various systems within the car. The demonstration raised public fears of car hacking, but did not seem to appreciably affect the public's appetite for connected tech in cars.